摘要
针对中国西南地区大型地下水电站厂房高边墙洞室脆性围岩开挖卸荷过程中出现的劈裂破坏这一特殊的工程地质现象,采用直线型滑移裂纹组劈裂简化模型,运用断裂力学、能量分析和裂纹扩展等分析方法,考虑围岩中原生裂隙的存在和在应力条件改变时,原生裂隙产生次生裂纹,继而形成近似平行洞室边墙的陡倾角劈裂裂缝的作用,获得洞室周边围岩的劈裂破坏判据和反映劈裂张开性变形的围岩位移预测新方法。并将新方法应用到锦屏一级水电站地下洞室群实际工程中进行验证,其劈裂破损区和位移预测值均与工程现场监测结果具有较好的一致性。此预测方法将为类似工程优化设计和优化开挖等提供科学依据。
Splitting failure happened frequently in the brittle surrounding rock mass of underground powerhouse cavern groups in southwest of China while excavation was performed.This kind of special engineering phenomenon has obtained become more and more attentions now.Adopting the linear slippage crack groups splitting model and applying fracture mechanics,energy analysis and crack propagation,the splitting criterion of cavern rock mass and displacement forecasting method reflecting splitting opening displacement was derived.Meanwhile,the effect of intrinsic cracks propagating into macroscopical splitting cracks parallel to the side wall of caverns approximately was considered.Moreover,the forecasting method was applied to the Jinping I hydropower station underground caverns engineering in China;the splitting failure zone and forecasting displacement were coincide with the monitoring data.The new forecasting displacement method could benefit the construction of similar underground caverns.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2011年第7期1445-1453,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学青年基金项目(41002098)
山东省优秀中青年科学家基金项目(BS2009HZ026)
高等学校博士学科点专项科研基金(20100131120046)
关键词
水电工程
地下洞室群
高地应力
脆性岩体
劈裂判据
张开性变形
位移预测
hydropower engineering
underground group caverns
high geostress
brittle rock mass
splitting criterion
opening displacement
displacement forecasting
